I am currently using both Xiom Vega Pro black and Xiom Vega Korea blue, been using those for 2 months and there are 2 things I want to talk about.
The first thing is Vega Pro is harder than Vega Korea, so I believe with tension rubbers, the harder they are, their max speed and spin potential will be higher than softer rubbers. But softer rubbers are easier to generate spin since I don't have to make a lot of force to sink the ball deep in the rubber.
The second thing is I want to discuss more about the top sheet wise, after a while playing and testing both Vega Pro and Vega Korea, I feel Vega Pro top sheet is grippier than Korea. I was kinda skeptical at first but then I checked them by throwing the ball to the rubber at an oblique angle to check the grippiness like how Kenta Matsudaira used to do everytime before is serving, it was true, when I reach to a certain amount of rotation, with Korea, it bounced off but didn't catch the whole spin of the ball. But with Vega Pro, it bounced off catch the whole spin. So I wonder is it just the new technology that makes new rubber less sensitive to the incoming spin? Or is it true that Vega Korea is less spiny than Vega Pro?